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Materials of Tank Armour
Fikar, Ondřej ; Němec, Karel (referee) ; Molliková, Eva (advisor)
This bachelor’s thesis named „Materials of Tank Armour“ deals at first with anti-tank ammunition and its distribution, followed by a brief description of some tanks constructed in Great Britain, Germany and Russia and their impact on development of tank technology. In the next part the thesis describes armour, basic principles of its function and division of armours according to its purpose and chemical composition. In conclusion, particular examples of chemical composition of some armour materials are introduced.
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Computational prediction of solubility limits in solid solutions
Fikar, Ondřej ; Friák, Martin (referee) ; Zelený, Martin (advisor)
This diploma thesis is focused on a theoretical study of the phase stability of solid solutions in selected aluminium and silver alloys. The ab initio calculations were performed using projected augmented waves method and the thermal dependencies of thermodynamic quantities were acquired using phonon calculations. The main focus of this work is the of aluminium-germanium alloy, while the other examined alloys (Al-Pb, Ag-Ge and Ag-Pb) serve the purpose of comparison of the solid solubility prediction and its reliability in systems with different composition. The temperatures, at which the solid solutions become stable, were evaluated using the energy difference between possible states and this evaluation was carried out for different contributions to the total energy. Also the electronic and phonon densities of states were calculated for all pure elements and solid solutions. The temperatures of solubility were compared to the experimental ones provided by the CALPHAD method and the individual contributions to the total energy were determined and depicted. The results obtained in this work tend to underestimate temperatures of solubility of individual solid solutions by hundreds of Kelvin.
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Computational prediction of solubility limits in solid solutions
Fikar, Ondřej ; Friák, Martin (referee) ; Zelený, Martin (advisor)
This diploma thesis is focused on a theoretical study of the phase stability of solid solutions in selected aluminium and silver alloys. The ab initio calculations were performed using projected augmented waves method and the thermal dependencies of thermodynamic quantities were acquired using phonon calculations. The main focus of this work is the of aluminium-germanium alloy, while the other examined alloys (Al-Pb, Ag-Ge and Ag-Pb) serve the purpose of comparison of the solid solubility prediction and its reliability in systems with different composition. The temperatures, at which the solid solutions become stable, were evaluated using the energy difference between possible states and this evaluation was carried out for different contributions to the total energy. Also the electronic and phonon densities of states were calculated for all pure elements and solid solutions. The temperatures of solubility were compared to the experimental ones provided by the CALPHAD method and the individual contributions to the total energy were determined and depicted. The results obtained in this work tend to underestimate temperatures of solubility of individual solid solutions by hundreds of Kelvin.
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Materials of Tank Armour
Fikar, Ondřej ; Němec, Karel (referee) ; Molliková, Eva (advisor)
This bachelor’s thesis named „Materials of Tank Armour“ deals at first with anti-tank ammunition and its distribution, followed by a brief description of some tanks constructed in Great Britain, Germany and Russia and their impact on development of tank technology. In the next part the thesis describes armour, basic principles of its function and division of armours according to its purpose and chemical composition. In conclusion, particular examples of chemical composition of some armour materials are introduced.
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